An erect evergreen tree or shrub with a height of 1.5 metres (5 ft) to 7 metres (23 ft). The plant has conspicuous and attractive inflorescence composed of racemes with yellow flowers. The plant flowers through the spring time between the months of September to January. The leaves of the plant are leathery and are arranged in whorls, most typically with three leaves per whorl. The leaves are generally regular in shape between 40 millimetres (2 in) to 170 millimetres (7 in) in length and 4 millimetres (0 in) to 30 millimetres (1 in) in width and have pointed tips. 
The species was first formally described by the botanist Étienne Pierre Ventenat in 1805 work Jardin de la Malmaison . Several synonyms exist for the species, including Chorozema callistachys as described by Ferdinand von Mueller in 1863 in Fragmenta Phytographiae Australiae; Oxylobium callistachys by George Bentham in 1864 in Flora Australiensis and Oxylobium lanceolatum by Karel Domin in 1923 in New Additions to the Flora of Western Australia.
- "ILDIS - Callistachys lanceolata Vent.". 2008. Archived from the original on November 30, 2004. Retrieved 3 April 2008.
- "Florabase - Callistachys lanceolata Vent.". 2008. Retrieved 5 April 2008.
- "Australian National University - School of Botany and Zoology". 2008. Retrieved 5 April 2008.
- "WRC/CALM - Native Vegetation of Freshwater Rivers and Creeks in south Western Australia" (PDF). 1997. Retrieved 5 April 2008.
- "Callistachys lanceolata Vent.". Atlas of Living Australia. Global Biodiversity Information Facility. Retrieved 4 January 2017.
- "Dave's Garden - PlantFiles Callistachys lanceolata". 2008. Retrieved 17 April 2008.